Question

I discovered to have some problem to fully understand callbacks scoping when trying to learn Jquery. I would add that i have little experience with the Javascript language The code:

var globDom;    // placeholder for DOM fragment  // Getting xml file; jquery parses the file and give me back a DOM fragment // saveXML is the callback  $.get(requestTarget, {}, saveXML);  // the globDom here is UNDEFINED !  alert(globDom);  // the callback  function saveXML(xmlDom) {     globDom = xmlDom; } 

I am sure that here there is a BIG misunderstanding by me …

Have any suggestion?

Thanks

Daniel

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Ah-Ah. Very clear, I understand perfectly the error in my assumption: i forgot to take in account the time lag between the access time to the data (previous!) and the time at which content becomes available. A quite serious flaw – batch programming biased 🙁 The problem is clear and I can now address it properly. Many, many thanks for responding!

Answer 1

What Herms said. your (simplified) timeline looks like

0.001 globdom = undefined; 0.002 $.get(somerequest, callback) 0.003 alert(globdom)  .. 50 milliseconds later ..  0.053 saveXml(xmlDom)